I just had another GTX 480 card dying yesterday.
Granted, it was heavily used (for long consecutive hours -- but temperature never raised above 85 deg.)

Am I still the only one?

Ozo.

[Edit] As explained later in this thread, this card was not dead. The instability seemed to come from a bad use (or a bug) of NVAPI while trying to disable Clock Throttling. After reverting to default settings, the stability problem was gone.